Serhiy Storchaka <storchaka+cpyt...@gmail.com> added the comment:
The problem is that
class C(B):
pass
C.__bases__ = (A,)
and
class C(A):
pass
are not fully equivalent.
In the first case type->tp_new != object_new.
----------
components: +Interpreter Core
nosy: +ncoghlan, serhiy.storchaka
versions: +Python 3.7, Python 3.8
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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue32768>
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